ANALYSIS OF GEOCHEMICAL CYCLES OF NITROUS OXIDE AND METHANE THROUGH ISOTOPE TRACERS

(1)氧化亚氮中的氮同位素比值不是由与海水、淡水和大气中氮分子的平衡决定的，而是由生产和消费过程中的动力学同位素分馏决定的。氧同位素比值大于40*，且随面积变化，表明在生产过程中或生产后氧同位素交换。(2)甲烷碳同位素比值主要由生产过程中的动力学同位素分馏决定。氢同位素比值随纬度变化，反映了生产过程中环境水的反映。用加速器质谱仪进行~(14)C分析还在准备阶段，部分数据已经采集。(3)环境水具有纬向梯度，与N_2O中的氧同位素比和CH_4中的氢同位素比密切相关。甲烷和水中的氢同位素比值是密切相关的。(4)配备电子捕获检测器的气相色谱仪因缺乏皇家居民点而未被引进。我已经拿到了批准的防护管理人执照，辐射危害防护规则已经定了。因此，它将在下一财年推出。

(1) Nitrogen isotope ratio in nitrous oxide is found to be not determined by equilibrium with sea water, fresh water, and nitrogen molecule in the atmosphere, but by kinetic isotope fractionation during production and consumption. Oxygen isotope ratio is higher than 40* with areal variation, suggesting oxygen isotope exchange during or after production.(2) Carbon isotope ratio in methane is mainly determined by kinetic isotope fractionation during production. Whereas, hydrogen isotope ratio is varing with latitude, suggesting the reflection of environmental water during production. Carbon-14 analysis with accelarator mass spectrometer is uuder preparation, some of the data has been taken.(3) Environmental water, which is closely related to oxygen isotope ratio in N_2O and hydrogen isotpe ratio in CH_4, shows latitudinal gradient. Hydrogen isotope ratio in CH_4 and water are closely related with each other.(4) Gaschromatograph equipped with electron capture detector was not introduced because of the lack in royal settlement. I have gotten the license of ratiation protection manager and rule for the protection of radiation hazard has been settled. So that, it will be introduced in the next fiscal year.